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Adverse events and complications induced by the guide wire placement or dilation without fluoroscopic control
| Complications | n | (%, 401 dilations) |
| Superficial mucosal tear | 3 | 0.75 |
| Tracheal intubation of Tracer | 1 | 0.25 |
| Severe hemorrhage | 0 | |
| Perforation | 0 | |
| Sepsis | 0 | |
| Death | 0 |
